#!/bin/bash

# Git url
GITURL=https://github.com/lvgl/lv_port_linux.git

# branch
BRANCH=release/v9.5

# library name
LIB_NAME=$(basename "$GITURL" .git)

# Cross compiler for cross compile on Linux server
CROSS_COMPILE=/opt/gcc-aarch32-10.3-2021.07/bin/arm-none-linux-gnueabihf-

# compile jobs
JOBS=`cat /proc/cpuinfo |grep "processor"|wc -l`

# this project absolute path
PRJ_PATH=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd)

# top project absolute path
TOP_PATH=$(realpath $PRJ_PATH/..)

# binaries build prefix install path
PREFIX_PATH=$TOP_PATH/install

# binaries finally install path if needed
#INST_PATH=/tftp

# download taballs path
TARBALL_PATH=$PRJ_PATH/tarballs

# check installed or not file
INST_FILE=$PREFIX_PATH/bin/lvglsim

# shell script will exit once get command error
set -e

#+-------------------------+
#| Shell script functions  |
#+-------------------------+

function pr_error() {
    echo -e "\033[40;31m $1 \033[0m"
}

function pr_warn() {
    echo -e "\033[40;33m $1 \033[0m"
}

function pr_info() {
    echo -e "\033[40;32m $1 \033[0m"
}

function do_export()
{
    pr_warn "cross(${CROSS_COMPILE}) compile $LIB_NAME"

    export CC=${CROSS_COMPILE}gcc
    export CXX=${CROSS_COMPILE}g++
    export AR=${CROSS_COMPILE}ar
    export LD=${CROSS_COMPILE}ld
    export STRIP=${CROSS_COMPILE}strip

    export PKG_CONFIG_PATH=$PREFIX_PATH/lib/pkgconfig:$PKG_CONFIG_PATH
    export LIBRARY_PATH=$PREFIX_PATH/lib/:$LIBRARY_PATH
    export LDFLAGS="-L$PREFIX_PATH/lib"
}

function do_fetch()
{
    if [ -e ${INST_FILE} ] ; then
        pr_warn "$LIB_NAME compiled already, exit..."
        exit;
    fi

    if [ -d $LIB_NAME/lvgl ] ; then
        pr_warn "$LIB_NAME source code fetched already"
        return 0;
    fi

    pr_info "start fetch $LIB_NAME source code"
    if [ ! -d $LIB_NAME ] ; then
        git clone -b $BRANCH $GITURL
    fi

    cd $LIB_NAME
    git submodule update --init --recursive

    cd $PRJ_PATH
}

function do_patch()
{
    FILE=user_cross_compile_setup.cmake
    TOOLCHAIN_ROOT=$(dirname $(dirname $CROSS_COMPILE))
    TOOLCHAIN_PREFIX=$(basename $CROSS_COMPILE)

    cd "$LIB_NAME" || exit 1

    if grep -q "${TOOLCHAIN_PREFIX}" $FILE; then
        pr_warn "toolchain already updated"
        cd "$PRJ_PATH" || exit 1
        return 0
    fi

    pr_info "modify toolchain config..."

    sed -i \
        -e "s#^set(tools .*#set(tools ${TOOLCHAIN_ROOT})#" \
        -e "s#arm-openwrt-linux-gnueabi-gcc#${TOOLCHAIN_PREFIX}gcc#" \
        -e "s#arm-openwrt-linux-gnueabi-g++#${TOOLCHAIN_PREFIX}g++#" \
        $FILE

    cd "$PRJ_PATH" || exit 1
}

function do_build()
{
    BUILD_DIR="build"

    cd "$LIB_NAME" || exit 1

    if [ ! -f "$BUILD_DIR/CMakeCache.txt" ]; then
        pr_info "configuring cmake..."
        cmake -B "$BUILD_DIR" -S . -DCMAKE_TOOLCHAIN_FILE=./user_cross_compile_setup.cmake -DCMAKE_INSTALL_PREFIX=${PREFIX_PATH}
    else
        pr_warn "cmake already configured"
    fi

    pr_info "building..."
    cmake --build "$BUILD_DIR" -j$(nproc)

    cmake --install build
    install -m 755 -D build/bin/lvglsim $PREFIX_PATH/bin/lvglsim

    cd "$PRJ_PATH" || exit 1
}

function do_depends()
{
    cd $TOP_PATH/libevdev || exit 1

    pr_info "build depend libevdev..."
    ./build.sh

    cd $PRJ_PATH || exit 1
}

function do_clean()
{
    rm -rf *${LIB_NAME}*
}

if [[ $# == 1 && $1 == -c ]] ;then
    pr_warn "start clean ${LIB_NAME}"
    do_clean
    exit;
fi

do_depends

do_fetch

do_export

do_patch

do_build